Theory: a Ditto is a failed attempt at cloning a Mew.
- They're both genderless and are about the same size and weight, as well as the same color and sheen.
- They both capable of replicating other pokémon's attacks.
- Mew is the ancestor of all pokémon, therefore sharing their DNA. Ditto can breed with nearly every kind of pokémon.
- The Cinnabar Mansion is where cloning experiments on Mew were performed, as well as one of the few places Ditto can be found.